<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        let user=prompt('请输入用户名')
        let password=prompt('请输入密码')
        if(user==admin && password==123456){
            alert('登陆成功')
        }
             else {
                alert('登陆失败')
            }
    </script>
</body>
</html>